Lamp-dimmer.



M. ENGERS.

LAMP DIMMER. APPLICATION FILED APR. 4. i914. RENEWED APR. 9. 1915.

Patented July 13, 191.

3 SHEETSS H,EET 1- I I. I

UTA/E5555.

M. ENGERS.

LAMP DIMMER. APPLICATION FILED APR. 4, 1914- RENEWED APR.

wmwww 3 5 4 J, W .Z 4 y 1 0 1 WIT M. ENGERS. LAMP DIMMER.

APPLICATION FILED APR. 4, 1914. RENEWED APR. 9. 1915.

' 1,146,143. Patented July 13, 1915.

3. SHEETS-SHEET 3- UNITED STATES rA'r nT ensig MARTIN ENGERS, OE TORONTO, ONTARIO, CANADA.

IiAMP-DIMMER.

Specification of Letters Paten t. Patented July Continuation of application Serial No. 778,045, filed July 9, 1913. This application filed April 4; I914,;,S eria1 No. 829,696. Renewed April 9, 1915.

I To all whom it may concern:

Be it known that I, MARTIN ENGERS, a British subject, and resident of the city of Toronto, in the county of York and Province of Ontario, in the Dominion of Canada, have invented certain new and useful Improvements in Lamp-Dimmers; and I do hereby declare that the following is a full, clear, and exact description of same.

My invention relates to an illuminating means comprising a source of light, a reflector therefor, and an adjustable-shutter which can be selectively moved to an open position for the radiation of all the direct and reflected rays or to a partly closed position for the radiation of all the direct rays and part of the reflected rays or to a closed position to intercept all of the reflected rays, the objects of my invention being: (a) to construct this shutter of a series of arc shaped sections, each of which is pivotally fixed at one end to a stationary part of the illuminating means and is provided at the other end with a projection having a limitedmovement in a radially slotted adjusting ring for moving the arc-shaped sections to their adjusted position and maintaining them in such position until it is again moved; and (b) to provide the adjusting ring with suitable stopping elements which will determine. the limits of the opening and closing movements of the shutter.

For an understanding of my invention reference is to be had to the following description and to the accompanying drawings, in which I Figure 1, is a vertical section of a lamp provided with an adjustable shutter in front of the source of light for controlling the re fiected and direct rays, the shutter in this view being shown in its closed position.

Fig. 2, is a front elevation of the shutter, in a. partly closed position, showing the adjusting ring and its connections with the shutter sections, this view also showing the stops for arresting the adjusting ring when it reaclu-s its limit of n'iovement in either an opening or closing direction. Fig.- 3, is a broken view similar to F ig. 2, showing the shutter in its closed position. Fig. 4, 1s a broken view showing the SllHtlZOIJIl its fully opened position. Fig. 5, is a plan view of the stops for arresting the movement of the ad usting ring, and Fig. 6, ma detail view of one of the shutter sections.

' tract the opening (3 and "if the mo\ Serial N0. 20,323.

Like characters of reference refer tol ke;

' parts throughout the specification andsdraw mgs. A

Within the casing 1 is a reflector 2 and a source of light 3, shown in Fig. l tohbegan incandescent electric lamp fixed in a holder; or socket 4 in the center of the reflector 2'. Fixed Within the casing-l is astationary ring or annulus 1 and vpivotallyconnected at 5 to the ring or annulus -1- are the irela tively stationary ends of the arc-shaped seetions 5 constituting the diaphragm of the shutter. These arc-shaped sections 5? .are preferably of such curvature that when the shutter is moved to 'its fully opened,. or partly closed, position the"- inner edges of; these sections will form a substantially. true circle as shown in Figs-9,3 and defthe drawings, so that 'theproj ectedrays will in all cases take the form of a cylindrical'beam of uniform inten'sityf throughout" i-ts cross: sectional area. 5 are moved from theiropen positionthey Whcn the shutter ."s'ec t-ions overlap each other andiform a substantially As shown in Fig. 1, "the shutter sections 5 are in front of the sourceof liglttior intercepting the reflected "raysg wh n; the shutter is moved to' its partly closedor fully closed position, but theshutte-rmay bel positioned between the source of lightrand" the reflector. l "i s At the free end of each of'the a shaped sections 5 is a'pin*7 operatingin-a' radial slot 8 in the adjusting ring *This ad- 'justing ring is rotatable in-pguides 10:,connected to the stationaryannulus 1?, jand" during its rotation carries with itthefiee'ends of the arc-shaped sections 5?,,"tlie,slots"*8 being provided for 'the change of position of the pins 7 with relationtfothe" adjusting ring'as-the latter rotates.

During the rotation of he 'adjusting' ring in the direction indicatedjb-y arrow in'Fig. 2,1;he arc-shaped sectionsaremove eijt of the adjusting ring in this di'rection' iscon- I tinned to. its limit of motion thefopeningfi will be contracted to"the diniensions' fshown in Fig. 3, whic h, for ordinaryjp'iirposs, is sufficient to intercept all of the reflect d' rays without intercepting the direct raysiffThe stop 12 for the adjustingfring', if desired,

may be so positioned that the arc-shaped sections can be moved to completely close the opening through the shutter so that neither the direct nor the reflected rays-can be projected.

When the adjusting ring is moved in the opposite direction to that indicated by arrow in Fig. 2, the arc-shaped sections are positioned to increase the size of the opening through the shutter until the shutter assumes the position shown in Fig. 4.

As shown in Fig. 2, the annulus or stationary ring 1 is provided with two fixed stops l1 and 12 respectively, and the adjusting ring 9 is provided with a stop 13 revoluble in unison with the ring and employed to engage the stationary stops 11 and 12 to arrest the movement of the adjusting ring when it comes into contact with either of said stops and thus limit the movement of the shutter in an opening or closing direction respectively,

v the cable. By means of this device it is possible to selectively move the shutter to 'a fully opened position for the radiation of all the direct and reflected rays, or to move it to a partly closed position for the radiation of all the direct rays and part of the reflected rays, or, to a closed position to intercept all of the reflected rays. i

Having thus fully described the nature of my invention, what I claim as new and desire to secure by Letters Patent, is

1. The hereinbefore described device comprising a reflector, a source of light, and an adjustable shutter selectively movable to an open position for the unobstructed radiation and reflection of all the light rays, or to a closed'position for intercepting all or part of the reflected rays, said shutter comprising a rotatable adjusting ring having a series of radial slots therein, and a series of arcshaped shutter sections one end of each of which is pivotally fixed, and the other end of each of which is movable and provided with a projection contained in one of said radial slots, said adjusting ring during its rotation engaging said projections and selectively moving the shutter sections to an open orclosed position.

2. The hereinbefore described device comprising a reflector, a source of light, and an adjustable shutter selectively movable to an open position for the unobstructed radiation and reflection of all the light rays. or to a closed position for intercepting all or part masses of the reflected rays, said shutter comprising a rotatable adjusting ring having a series of radial slots therein, and a series of arcshaped shutter sections one end of each of which is pivotally fixed, and the other end of each of which is'movable and provided with a projection contained in one of said radial slots, said adjusting ring during its rotation engaging said projections and selectively moving the shutter sections to an open .or closed position, two fixedly positioned stops, and a stopping. member for the adjusting ring to engage said stops and arrest the movement of the adjusting ring when it has reached its limit of motion in either an opening or closing direction.

3. The hereinbefore described device comprising a reflector, asource of light, and an adjustable shutter selectively movable to an open position for the unobstructed radiation and reflection of all the light rays, or to a closed position for intercepting all or part of the reflected rays, said shutter comprising a rotatable adjusting ring having a series of radial slots therein, and a series of are shaped shutter sections one end of each of which is pivotally fixed, and the other end of each of which is movable and provided with a projection contained in one of said radial slots, said adjusting ring during its rotation engaging said projections and selectively moving the shutter sections to an open or closed position, two fixedly positioned stops and a stopping member for the adjusting ring to engage said stops and arrest the movement of the adjusting ring when it has reached its limit of motion in an opening or closing direction, said stops and stopping members being clear of the path of the direct and reflected rays from the source of light and reflector.

4. The hereinbefore described device comprising a reflector, a source of light, and an adjustable shutter selectively movable to an open position for the unobstructed radiation and reflection of all the light rays, or to a closed position for intercepting all or part of the reflected rays, said shutter comprising a rotatable adjusting ring having a series-of radial slots therein, and a series of arc-shaped shutter sections one end of each of which is pivotally fixed, and the other end of each of which is movable and provided with a projection contained in one of said radial slots, said adjusting ring during its rotation engaging said projections and selectively moving the shutter sections to an open-or closed position, and means for causing the rotation of the adjusting ring to effect the opening and closing movements of said shutter sections. 1

5. The hereinbefore described device comprising a reflector, a source of light, and an adjustable shutter selectively movable to an open position for the unobstructed radiation closed position for interceptingall or part L iane and reflection of. all the light rays, or to a of thereflected rays without intercepting the dir'ectra'ys, said'shutter comprising a r tatable adjusting ring havmg a series of ray dial'slots therein, and a series of arch-shaped shutter sections one-end of each of which .is

pivotallyfixed, and the other end-of each of which is movable and provided with a projection contained in one of said radial slots,

4 said adjusting ring during its rotation engagingsa'id projections; and selectivelym'ow ing theshutter sections to either an open or closedposition, two fixedly positioned stops and a stopping member for the ad usting ring to engage said stops and arrest the movement of the adjusting ring when it has eflfect the opening and closing movements of' I said shutter sections.

1 6'. The hereinbefore described device comprising a casing,'.a reflector and a source of end, a rotatable ad usting ring opposed to lighttherein, a stationary annulus opposed to the reflector, an adjustable shutter comprlsing'a series of 'arc-shaped shutter sec-j tions each pivotally fixed at one end to said annulus and having aprojection at the other end, a rotatable adjusting ring opposed to the annulus and havinga radial slot therein for each of said projections whereby the adjusting ring will engage said projections and selectively vcause the opening and closing movements of said shutter sections, and

stops'to arrest the movement of. the adjusting ring when it has reached its limit of motion in either direction, said stops being clear of the path of the-direct and reflected rays from the source of light. The hereinbefore described device comprising a casing, a reflector and source of light therein,'a stationary annulus opposed to the reflector, an adjustable shutter comcoples at this patent may be obtained for prising a series are-shaped; shutter sections each pivotally fixed at one,end, to-said v annulus and having a projection at the other end, a rotatable adjusting ring opposed to the annulus and having a radial slot therein for each of said projections whereby the adjusting ring will engage said pro ectlons and selectively cause the opening and closing 'movements of said shutter section's, stops to arrest the movement of the ad ustlng rlng '55 either direction, said stops heing'clear' of a when it has reached its limit of motion in the path of the direct and reflected rays from the source of light','and means for actuating theadjustingring to eifect the open-*2 ing and closing movements of the shutter sections.

8. The hereinbefore described'device-comprising a .casing, a' reflector and a source of light therein, a stationary annulus opposed to the reflector, an adjustable shutter comprising a' series of arc-shaped shutter sections, each pivotally fixed at. one end to said annulus and having a projection at the other the annulus and havin 'a radial slot therein adjusting ring will engage said projections as Y.

and selectively cause the-opening'and closing movements of said shutter sections, stops to arrest the movement of the adjusting ring when it hasreached its limit of movement in either direction, said stops .being clear of the path of the direct and reflected rays fromithe source of light, means for selectively moving the adjustingring in one direction, and spring-pressed means for movin'g)it in the opposite direction.

ated this fourth day of March, A. D.

' MARTIN'ENGERS, Witnessesz" f C. H. Rlonns,

P. DE \MONTEGNY KENNEDY.

flvecents each, by addressing the Commissioner 0! Datum, WashIn'gtom-D. .0. 

